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Brain-Eating Amoeba's Persistence May Aid Brain Invasion

Researchers are investigating the behavior of Naegleria amoebas, including the deadly Naegleria fowleri, to understand how they might infect the human brain.

Naegleria amoebas, commonly known as brain-eating amoebas, are typically found in warm freshwater and feed on bacteria. However, their exploratory and persistent movement patterns may enable them to travel from the nose into the human brain.

Studies using a harmless species, Naegleria gruberi, revealed that these amoebas relentlessly move forward through narrow channels, even those smaller than themselves, and rarely change direction. This persistent behavior was observed to sometimes increase their speed.

These traits, while useful for hunting bacteria in sediments, could also explain how Naegleria fowleri can cause fatal infections in humans. Infections are rare, with fewer than 10 cases annually in the U.S., but nearly all are lethal.

The research, published in the Proceedings of the National Academy of Sciences, focused on understanding the basic biology of these organisms, about which little is known. The observed behaviors in Naegleria were not seen in other amoeba species tested.

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